This adds backup, restore, coloration and many more checks to the upd…

…ate-vsintegration.cmd (#3672)

* This adds backup, restore, coloration and many more checks to the update-vsintegration.cmd

* This adds backup, restore, coloration and many more checks to the update-vsintegration.cmd

* Remove ambiguous an irrelevant instruction, improved help and instructions

* Fix a scenario where the return code wasn't nonzero for error conditions, fixes not creating backup dir when not backing up